Precision boring-machine



B. M. W. HANSON.

`PRECISION BORING MACHINE.

APPLICATION FILED JULY 9. |917.

Patented Dec. 2,1919.v

6 SHEETS-SHEET l..

B. M. W. HANSON.

PRECISION BORING MACHINE.

APPucATIoN man nuwe. |917.

Patented Deo. 2, 1919'.

6 SHEETS-SHEET 2.

B. M. W. HANSON.

PniclsloN BORING MACHINE.

APPLICATION FILED 1ULY9. 1917.

Patented De. 2,1919.

6 SHEETS-SHEET 3 muuu LII l IIIUI.

B. M. W. HANSON.

Pai-:clsloN BomNG MAcHmE.

` APPLICUON FILED JULY 9| QI. 1,323,267. Patented Dec. 2,1919. 6 SHEETS-SHEET 4 ,S A .Qi ...1. ...-f m5 NAR m# R r A. w .m... -L a-- w+ No E mw... Nw MN am. .klm mf--- u ll E Im- 'L N Q .m

B iwf/iron 4 M. l# 8 f.

B. M. W. HANSON.

PRECISION BORING MACHINE.

APPLICATION msn lum/9,1917.

Patented Dec. 2, w19.

6 SHEETS-SHEET 5.

lul/Enron M. M4 #Mw B. M. W. HANSON.

PRECISION BORING MACHINE.

IIIIIIIIQIMIIWII .Il

PIIIIIIIIQII Dee. 2,1919.

6 SHEETS-SHEEI 6 I Ma/J0 APPLICATION FILED JULYSI 19H.

mgm.

'i so g V'narran srnirns PATENT omnon.

BENGT IVl. W. HANSON, OF HARTFORD, CONNECTICUT', ASSIGNOR TO PRATT &, WHITNEY COMPANY, 0F NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

PRECISION BORING-MACHINE.

Specification of Letters Patent.

Patented Dec. 2, 1919.

Application filed July 9, 1917. Serial No. 179,412.

2' 10 all whom t may concern.'

lle it known that I, I'nno'r M. lV. HAN son, :r citizen of the United States, residing t "hartford, in the county of Hartford and ist, have invented cert-ain e of (JonnectrV nf and useful Improvements in Precision lloringliilachines, of which the following is a specification.

.il machine embodying the invention is particularly adapted for accurately locat and boring holes and is primarily intended for use in making jigs. The construction of the machine is such that the holes may be located within the limits of accurac attainable with commercial measuring instruments without requiring the tedious processes and the high degree of skill usually associated with such work.

".lhc machine comprises an axially fixed boring spindle which is preferably vertical and a work-carrying mechanism comprising a carriage and a table which are movable at right angles to cach other under the control of suitable traversing devices such as screws. lvl'echanisms independent of the traversing devices are provided for measuring and iinlicating the amounts of movements of the carriage and table respectively. @ne of the objects of the invention 'is to provide in a machine of the general charac-ter set forth improved measuring devices which are readily adjustable for a wide range of movement, which are extremely accurate and which can be easily and quickly read. Another object of the invention is to provide improved means for holding the work and for supporting and guiding the boring bar. Other objects of the invention will be apparent from the following specification and claims.

In the drawings I have shown the embodiment of the invention which I now deem preferable, but it will be understood that the drawings are intended to be merely illustrative and are not to be construed as delining or limiting the scope of the invention, the appended claims being relied upon for that purpose.

Of the drawings:

Figure l is a side elevation of a machine embodying the invention.

' 'r2 is a front elevation of the machine.

Fig. l is a fragmentary front elevation on an enlarged scale showing the left-hand side of the carriage and table upon which the work is supported and moved.

Fig. 4 is a view showing the right-hand side of the carriage and table.

Fig. 5 is a horizontal sectional view on an enlarged scale showing the devices for moving the carriage and for measuring and determining the amount of movement. The section is taken along the line 5 5 of Fig. S.

Fig. G is a fragmentary vertical sectional view talren along the line 6-6 of Fig. 5.

Fig. T is a fragn'ientary plan view on the same scale as Fig. 5 showing the micrometer head and the inclosing casing therefor.

Fig. 8 is an elevational view taken from the right showing the parts appearing in Fig. 5.

Fig. 9 is a fragmentary sectional view talen along the line 9-9 of Fig. 5.

F ig. 10 is a fragmentary sectional view taken along the line 10--10 of F ig. 5.

Fig. 11 is a fragmentary plan view partly in section showing. in detail some of the de vices for holding the work and for supporting the boring bar.

Fig. l2 is a fragmentary elevational and sectional view showing some of the parts appearing in Fig. 1l.

Fig. 13 is a fragmentary elevational view taken from the right and showing the parts appearing in Fig. 1l.

Fig. 14 is a diagrammatic view which will be referred to in describing the operation of the machine.

Referring to the drawings, l represents the main base upon which the other parts of the machine are mounted. Extending up`- ward from the rear part of the base is a hollow column 2 which supports the spindle and the operating and controlling parts therefor.

The column 2 is provided at 3 with suit.- able guideways and a head l slidably engages these guideways so as to be capable of movement upward or downward. Suitable means are provided for moving the head upward or downward, which means may consist of a rack carried by the column and a pinion carried by the head. These parts are not illustrated, but at 5 there is shown a squared shaft by means of which the pinion may be turned. Preferably a counterwcight'G is provided for the head. being connected therewith by means of a chain 7. After adjustment the head can be clamped in adjusted position by any suitable means such as the bolts 8.

Slidably mounted in suitable bearings l) on the head is a sleeve Within which is rotatably mounted a spindle ll. The sleeve l0 When moved vertically in its bearings carries the spindle il With it. Suitable means are provided for movingl the sleeve, Vwhich means may be understood to comprise a rack carried by the sleeve and a rotatable pinion carried by the head, these parts,4

however, not being shoivn. F or turning the pinion any usual or preferred mechanism may be provided, and this mechanism is not shown in detail as it or itselit constitutes no part or the invention. lt may be 1)ointed out, however, that this meehanisn'i pieter ably conn 'ises a hand Wheel l2 by means of which the pinion can be turned for a rapid movement of the spindle and hand Wheel 153 by means ot which the pinion may be turned slowly ifor hand Jfeeding. i"'reieru ably means are also provided for power feeding7 power being' received through a rotatable sha-itt ldand transmitted to the pinion by means oit change-spoed gearing con trollcd by levers l5 and 1G. reiferably the sleeve and the spindle are provided with a counterbalauee 17 which is connected by means or a chain 18.

Secured to the top of the column 2 is a bracket 19 provided with bearings Q0 and 2l in which the spindle rotates. ltotatably mounted ou the spindle betiveen the tivo Meariugs is a belt pulley 25), and a friction clutch having a controlling` lever Q-/i is provided whereby the pulley may be connected to or disconnected 'troni the spindle. The spindle has a splined engagement' with the clutch7 thus permitting the spindle to be n'ioved vertically Without intertering` with the power connection.

The bracket 19 also carries a gear box Q15 in which is positioned suitable gearing for transmitting povver from the spindle to the aforesaid shaft A. The last said sha-ft has a splined engagement with the gr-iaringin the box, thus permitting the vertical movement of the shatt with the head l without interfering With thepoiver connection.

Carried by a horizontal drive shaft 26 mounted on the base l are tight and loose drive pulleys 27 and From the drive shaft Q6 poiver is transmitted through suitable change-speed gearing to a second shaftV 29. This gearing is not shoivn but it may be of any usual or preferred type and may be controlled by levers 30, 3l and 32. For starting and stoppingv tae machine there is provided a belt shifter 33 adapted to move a A ineens? As shown, this rod 35 carries a brake shoe 36 which can be moved into engagement with the tight pulley 27 to brake the. inachine. Preferably a suitable interlocking mechanism is provided which prevents the shifting ot the levers 30, 3l and 32 except when the belt shifter is in its left-hand position as shown in Fig. 2. At the back of the machine there is a belt pulley 37 mounted on the aforesaid shaft 29. A belt 3S passes over the pulley 37 andalso over the atoresaid pulley 22 on the spindle ll. This belt is guided over suitable idler pulleys and e0.

From the foregoing description it Will be clear that the spindle may be started and stopped as desired and may be rotated at any one or a plurality of speeds. The spindle is rotatable about a ixed axis and a drill or a boring bar such as indicated by A in Figs. l and 2 may be connected to it in the usual Way. in attainingi the ex renie accuracy which is necessary ind it highly preferable to use a vertical spindle such as described. It a horizontal spindle were provided errors Would arise from the deflection of the spindle because oit its own weight and from the uneven Wear et the spindle bearings.

The bed l is provided with suitable wa elfi upon Which is mounted a carriage n adapted to more forward or backward as roquired. The movement. oit the carriage is effected by means et a travers.z device such as a screwv #l-3 provided with a hand Wheel ffl-d. fitter movement the carriage can be clamped by means oi? bolts The earriage is provided with guides@ 's -il-( at right angles to the Ways di. l-."lorable along the guideivays d6 is a work-carrying" table d? and tor moving the table there is provided a` traversingv device such as a screvY l-S having a hand Wheel The table is provided with "lslots 50 by means ot which .vorlr to be drilled or bored may be clamped in place.

From the foregoing description it will be clear that inasmuch as the axis ot the spindle 1l and or the drill or boring baris fixed7 the rela-tive positions or the holes to be drilled or bored in the Work are deter ned by movingF the carriage #l2 and the table 4:7 through the proper distances. @ne et the important te( tures ot in invention consists of mechanisms for niovingg the carriage and the table ly mea-ns t the screws i8 and i8 and for accurately determining; and measuring the extents ci movements.

Mechanisms in all respects ali re are i govided for turning` the respective screivs i3 and a8; and othern'xeehanisnis in all respeets alike are provided for respectively determiningr and measuring4 the positions and movements et the carriage with repeet to the bed and oli the table with respect to the carriage. lt will be sutiiciont to describe in detail but one ,et of these mechanisms and I will describe those associated with the table Li7, it beingunderstood that those associated with the carriage l2 are exactly the same.

The hainl wheel 1li) is not connected directly to the screw or shaft but is so mounted as to be capable ot rotation independently thereof. The hub of the wheel is provided with a llange 5l having a conical bore, and mounted on the sha-"ft is a sleeve or collar 52 having a conical surface adapt ed to engage the conical surface of the llange. A rod 58 is movable longitudinally in a central aperture in the shaft and is connected with the collar 52 by means or a transverse pin or key 54. rThis key extends through a slot in the shalt which is lonp; enough to permit 'tree movement of the key. ,.fil; the end or the shaft is a collar 56 having threaded engagement with the hub of a knob 57 which is connected with the rod By turning the knob the rod can be moved longitudinally to bring the collar .into or ont of engagement with the h and wheel and thus connect the hand wheel with the shaft or disconnect it therefrom.

A hollow bracket 5S is secured to the car riage l2 in position to surround or inclose the shaft 448. Positioned within the bracket 5S and loosely mounted on the shatt is a worin wheel i9 which meshes with a` worm ($0. The worm is rotatably mounted in the bracket and there provided a knob 01 by means of which the worm may be turned. T he worm wheel 59 is provided with conical suriace which is adapted to be engaged by a second conical surface on the aforesaid collar As already described, the collar 52 when moved toward the right connects the hand wheel 49 with the shaft; but when the collar is moved toward the left it not only disengages the hand wheel but also connects the worm wheel with the shaft, whereby the shaft may be turned by means of the knob (il acting through the worm G0. It will thus be Clear that for rapid traverse of the carriage the screw 4-8 may be turned by means of the hand wheel and that for a very'slow or minute movement the screw may be turned by means of the knob 61. Then the collar 52 is in an intermediate position the hand wheel and the worm wheel are both disconnected lrom the shaft and any accidental or inadvertent movement thereof is prevented.

Connected to the carriage 4:2 is a bracket upon which is mounted the mechanism for determining and measuring the movement of the table. Adapted to cooperate with the measuring mechanism is a measuring rod @3. T his is slidably nnnnitcd in a bearingbushing; lill carried by the table. rlhe rod is of sul'licient length to permit its adjustment into direct cooperative relationship 'with the yieasuring mechanism with the table in either extreme or any intermediate position. After adjustment the rod can be clamped in place by means oi a set screw G53. For supporting` the rod there is provided a suitable inea-ns fixed against movement with the table. Preferably 'this means comprises two parallel horizontal rails 66, 6G which also ex tend through the bushing (il at opposite sides olf the rod. T he corresponding rails for the f -arriage are shown in section in Fig. 3 and it Vwill be observed that the tops of the rails are preferably beveled oppositely to present a trough. The rails are held against longitudina-l iii/eroine it by means of a bolt G7 which extends 'through a lug G8 secured to the bracket G2. The rails are preferably a little narrower than the rod, and the rod is provided with a cross piece 69 which rests on the rails and which serves a handle where by the rod may we readily moved. A5 already stated7 the rails 6G, G6 beveled to form a trongh and this trough ie adapted to receive one or more end measures such as in dicated by 70.

The bracket 62 is enlarged and recessed to provide a cylindrical chamber 71 having its axis in exact alinement with the axis of the end measures 70. Positioned in the chamber 71 is a bushing 72 which is slotted at 7 3 :tor a purpose to be presently set forth. Fitted to the ends of the bushing 72 are shouldered washers 74, 7 d. The bracket 62 slotted alongone side of the bushing 72 as indicated at 7 5 and clamping screws 7 6 are provided whereby the bushing 72 may be rigidly secured in place. It will be noted that the shoulders or' the washers 74, 74: prevent the bushing from being contacted because of the slot 73. Preferably, in order to prevent any possible contraction of the bushing at the center where it is not directly supported by the washers, the walls of the chamber 71 are cut Laway as indicated so as to provide contact with the bushing only at the ends thereof.

Slidably mounted in the central apertures of the washers 74, 74 is an elongated sleeve or casing- 77. This is held against rotative movement by means of a key 78 engaging a longitudinal keyway in the bushing 72. Asshown *most clearly in Fig. 6, the bushing 72 is provided with a shoulder 79 which cooperates with a flange SO on the casing 77 to limit the .longitudinal movement oit the casing. The actual amount of movement permitted is very small and is greatly exaggerated in Fig. 6 in order that it may clearly appear. In practice it is preferably exactly TEW of an inch. The easing 77 is normally held in its forward or lett-hand position by means ot a coil spring- 81.

Slidably mounted in the casing` 77 is a tube S2 which is held against rotative movenient by means oi' a ley 823 litting a longitudinal liey'way in the tube, as shown in Fig. 5. The tube is litted to the body of a micrometer head Sli. This micrometer head is, o at least may be, oit standard commercial construction and it will not be necessaiu to here describe it in detail. The caoing Ti" is cut away as indicated in Figs. l and Y 'to permit the micrometer barrel to be turned and to enable the' micrometer readings to '3e observed. The casing 77 is closed at its rear or right-hand end by m. ms ol a plug,` S which is engaged by the outer end of the micrometer Darrel. The aforesaid tube 82 extends towarc the lett beyond the end of the stem oiC the micromeer head where it engages a :lange formed on a rod or stem n This rod extends el). tllrougli 'the central opening ot a bushing Si' mounted in the casing` 7i' and the rod is .normally held in its extreme right-hand position with respect to the casing by means oli' a coil spring S8. The stem S6 is adapted to co'lper; "e at its left-hand end with the measuring rod 63 either directly or indirectly i f means ol one or more oli the end measures and the stem together witl the tube 82 eifi'ect constitutes an extension et the micrometer head. By turning the micrometer barrel the tube S2 and the stem S6 can be moved relatively toward the le'lt to any desired extent a indicated by the micrometer lll readiu fs, il seing understood that the microme barrel islield rela-tively fixed by reason ci its engagement with the plug S5. rVlie direct readings or the micrometer head represent the, actual movenent of the stem 5G toward the lett. The micrometer head is graduated so that each derision represents 1610-0- of an inch.

As has been stated. the easing,` 'i7 is normally held in its lett-hand position by the storing S1 which resists any movement toward the right. Thus the spring serves to cause a. uniform prede ermined p essure at all contact points of the measuring rod 63, of the stem 86 and oi" the end measures. This uniformity of pressure is of the highest importance iu precision work.

Then contact is effected the casing,l 7'." is moved and the spring' 81 is compressed. The exact amount of. m vement must be under control or at least capable of measurement in order that accurate results may be obtained. lith this end in view l provide precision device which can be used to enable the operator to secure exactly the same amount of movement or any desired amount on movement for successive adjustments and successive operations. re'lierably the precision device is a dial test indicator which not only shows uniformity of movements but which will show and measure diiiferences. The dial test indicator is separate trom and head.

lositioned in the slot oi the bushing T2 is a lever S9 which is mounted on a pivot pin 9G. Suitable bearings 91 and 92 are provided for the pivot pin and prete 'ably the upper bearing 92 is pressed downward by means oit a spring 93 so as to prevent any possible looseness. rilie lever S9 is provided at 911- with a qni'lie edge which is adapted to contact with a hardened steel pin fitting in an aperture ii the casing 77.

The bracket is formed with a recess or pocket adapted to holda dial test indicator which is or may be of standard commercial jliorm. Preiierab y the indicator is constructed and graduated so that each division of the dial repr sente 17%@ olf an inch. There is a cover 9G which prothe indicator v-:hen not in use and which is pivot-ed so that it can be swung upward when required. The inc" itor 95 is so positioned that its actua'lin` pin 97 is in engagement with the lever The pin iT contacts with the lever 89 at a point which is at a predetermined distance from the pivot 90. this distance being a delinite multiple of the distance from the pivot 90 To the lniiie edge lrelieraliily the ratio is 10 to 1 and by reason oit this ratio a movement ol` the pointer oit the indicator over one dial divion represents L movement et the casing 7]" ol: et an inch.

The wort; to be bored muy be supijiporte" directly on the table -l' but in most cz i prelerablo and more convenient to pioride :nipplemental supports or parallels and :'l?. These are shovn ii letail in lllirj's. 11, 12 and 13. ist will be ooserved that each ol 'hein is provided with a lower liorizotnal supplemental to tbc micrometer p ate or flange 1,00 having holes through which may be passer` T-bolts 'lor securinij the supportingl member to tbe labio. Each oi 'the sunporting members is also provided w"'li vlo@ e' tloiico "n 1"0' y\ ll. L l) (t i' bl. .i (aide L1 Nablus; lib iop si ri'ce exactly pa allel to the bottom surface. ot the ila nre oI plate 100. 1n the top j late 101 are formed 'lf-slots 102 which are exactly parallel to the T-sloi's 50 olf the table vlien the supporting .membersl are .in place. rlhe edges oi' each bottoni plate 100 are inclined with respect to the sides oi? the corresponding top plate 101, as clearly shown in 11. Connecting the top and bottom plates ot each supporting member vertical web 103 wliivcli is inclined in accordance with the inclination et the forrespondingi edge ci the lower plate 100. As clearly shown in the drawings the two supporting members 98 and 9S) are oppositely termed so that the two vertical webs 103, 103 are ol'ipositel'v incline d to provide a space benath the plates 101, 101 which gradually increases in width toward the rea-r oi the un rneath the Worli into which the drill or b .ir tool can extend without injury to the table.

l' iblyg, in order to guide and support the dL or boring bar` 1 provide a supple mental support bracket 10l which engages the -vertical nf'ays 3, 3 on the column This braelet is adjustable yertieally along these trays and c, ,r be clamped in adjusted position by means of a gib 105 eo trolled by :fcreiy 106. lit the forward end the bracket 104 is provided with a hub 107 haring a central circular aperture the axis of Wl `oh eiae'l" alinenient with the axisfot the spindle 11. l ilurality ol bushings are pio vided each adapted to fit the aperture in a 'lfhese bushings have different hub 10.7.

internal diameters and one ot the bushings oir-fn in the drawings at 108. A pin revent the bushing from tu rni n gj, dvb en usted to a position below the Werk, as y trie drawings, and a bu, ing 105% is prorided oil suitablesizo to .it the levier end oll the boring bar. 1n

this wry the boring bar'is supported and iis clearly appears in Figa 11 and n et the supplemental supports S faith that the bracket d may be positioned na"'*ly luider the top plates 101, iso-n et this e nstruetion it is p ble to place the supplemental supports quite elose together to rigidly hold the Wort and at saine time oonsieerahle range ot ,ment ot the Carri sie and el? the table is ole without any interference between iraelret 101i and the supports.

iianner ot use of the machine can it explained by setting; forth the steps incidental to the drillnig; or boring of holes pr ,termined positions in a speeilic piece a'orli suehas that shown in the diagramie Fig'. 11i. 1t will he understofxi that in Y. z is net-essa to first drill a hole et smaller dian'i than that desired and then here the hole to the eXactsize called The particular piece Werl; shown is {er/ely tor illustration and it will w 1i@ferretood that the machine is capable t use on Work of a ,vide.' variety of shapes and sizes and that the manner ot use will vary in aecorclanee with the Character of orl, the variations in the manner of e' obvious to those skilled in this art 14 shows a plate in which it is desire/d to bore holes` at the points B and C. The plate is lirst loosely clamped to the pleinental supports 0S an d 90 and is then usted into exact parallelism with the i et movement ot the table -l7. This is z yeeniplished by movingthe carriage longitudinally and by so adjusting the plate that by means of feelers-it is ascertained Ato be at all points equidiotant from a boring;A bar di secured to the spindle. The boring bar is of known diameter and Will be assumed to be exactly one-halt' inchx Then exact parallelism is obtained the Work is firmly clamped in place.

Then both mieromete rs are set at Zero. 1n this connection it will be remembered that each of the rods 8G constitutes an extension ot the eorresponeing micrometer head and is held in its outermost position by means et the springrSS. 1t Will also be remembered that each sleere or easingn 77 is initiallyY held in its innermost position by means of the eorresponding spring S1. lith the end of the Work in Contact with the boring bar A the measuring rod 63 ot the table is moved into Contact with the rod 8G of the Correspending;` mtasuringl mechanism, the measure ing rod being moved outward suilieien'tly to slightly more the caf-ling` 77 outward and thus swing the lever 89 and more the indicator pointer ser` eral divisions over the dial. Then the rod 03 is clamped by means the sereiy and the indicator dial is turned so that the Zero point ot the dial lies under the pointer.

NeX-t the Carriage and the table are moved to bring the side et' the Work into Contact with the boringbar A. Then the measuring' rod G3 for the carriage is moved outward into Contact with the rod 86 ot the corresponding; measuring' mechanism, the pointer of the indicator' beingr moved over several divisions of the dial. The n easuring rod 63 is clamped in place and the indicator dial is turned to bring the Zero point under the pointer.

1t will. be clear in order to bore the hole B that the Carriage must be moved one and one-quarter inehes (the distance called 'for by the drawing' plus one-half the diameter of the boring` bar) toward the rear from the position represented by the adjustment ot the corresponding measuring rod 63, and that the table must be moved one and three quarters inches (the distance called for by the drawing plus one-half the diameter of the boring bar) toward the lett from the position represented bythe adjustment of the Correspending` measuring rod 63. The carriage is first moved toward the rear a little more than the required one and oneouarter inches. as soon as the rod 63 is disengaged 'from the stem S6 the pointer of the indicator will move away from the zero CIJ point A one-inch measuring)` rod is placed on the rails GG, 66 and the micrometer head is set a Then the carriage is slowl7 moved toward the front, use being made of the knob (il acting through the Worm 00 and the worin `wheel 59. This n'ioveinent is continued'until the measuring rod contacts with the stein 86 and in it sufficiently to bring the pointer of the indicator to zero. Thus the indicator serves to insure the movement of the ca and the compression of the spring to exactlv the same extent as initially. Tl is new positioned exactly one and ne Work is nenni re inches bach of its `forward position. The carriage is clamped in this position and the measuring' rod is removed.

Next the table moved a little more than one and three-queues inches toiva'd the leit. The pointer of the corresponding indi* cater moves aivajv fr in the Zero poinr under the induence of the spring` Si. A one-inch measuring rod is` placed on the Correspond ing ils G0, 0G and the Corresponding niicroine er is at .750. Then the table is moved slowly toward the right until the ineasurjlnggl rod engages the stein 86 and moves the indicat -r pointer to Zero. Then the table is clamped in place and the measuring rod is removed.

he ivorh is nonY in the correctV position for drilling' and boring hole B.

In a similar manner die machine navbe set for boring hole C. The Work must be positionecL 22812 inches to the rear and 4.8125 inches to the left oli the original or Etero position. The carriage is first nioved toward tl e rear and a tivo-inch measuring 'od is put in place. The micrometer is set at .281 and then the car 'iage is moved forivi rd until the indicator militer passes the :1ero point and is opposite the point .0002 of the dial. ln this ease the indicator not only shows movement of the casing to the same extent as initiallj,7 but also supplemental nov'ement of .0002 inch. The sum oi the readiness) -.28ll-.0002 1s 2.2812 vvhich is distai ce. The table is then toward the left and a four-inch measurina1 rod pnt in place. The micrometer is set at .812. Then the table is moved to Ward the right until the pointer of the indicator moves past zero to the point .0005. The sum of the readings Al-l.812-{.0005 .8125 vrhieh is the desired distance.

tear ci! follow if Jthe method last deloeahinp,` die second hole C, the i e nod is in mmv cases prefer- Without moving` either the carrie or the table afterV the boring;` of hole B the niicroine heads l to zero and the the desired are returned alle. rods G3 are moved Ato again engage the corresponding micrometer spindles and slightl;T com dress the springs S1 and move the indicater pointers, The dials or" the'indieators under 'die influence of the spring 8l. Y

are turned to bring the :aero points under the new positions ci the pointers. ,fhus the position of the hole B is established as tlry zero position.

d fl

1.0312 Which is .i

vhe hole T the des hole C in front oi n. he t' moved toward the le'lt and a tin'eonich measuringl rod is put in ple i i so G6. The inici-mieter is set i .0 the carri:A V inoved toivaix,

the pointer` oli the and reaches the point .00( readings 3-[-.0 3Q-l-.0005 g.;

e Os the desired distance right of holo B.

lt will be seen, that the nieasnrin J Y i the dial indicator are so conne f; lated that in either case the d ment is indie tec by the su'n o F of the meaunring rod or of U head and the dial indifU may therefore be made auxiliar;7 calculations. measured bj; the measurf tions of an inch in even directly;7 on the inicremey thousandths, it any, are read f dial.

What l claii i is:

l. The combi n tion in a of a. boringv spin-ole rotatable axis, a ,vn'l ta'nle morali-le l the spindle. inanuall,v operai moving the table, and meelV ent of the table moving nrcan.;

noincd out,

ian

the table niovens-int the comprising a micrometer head .-l a sup,- ie

mental dial indicator.

2. The combinati ,n in of a. boringl axis, a hed. a carrian transversely or the spindle, i, alle H5 movable on the carriage tianmewely o5" the spindle and at right angles d" of carriage n;ovemerd;` man peeing a micrometer head and a supplemental dial indicator ior .incanning` the table movement, and means tor holding end measures in cooperative relation with the measuring mechanism.

4.-. The combination in a boring' machine, oii a boring' spindle rotatable about a i'ixed axis, a bed, a. carriage movable on the bed transversely of the spindle, a 'Svc-rl: table movable on the carriage transversely oi the spindle and at right ai les to the direction oit carriage movemen mechanis s each comprising` a micrometer head and a sun plemental dial indicatorI im ineastaring` spectively movement ol? the carriage on the bed and of the table on the carriage, amil means for holding' end measures in cope itive relation with each measuring;- mechamsm.

The combination in a boring machine, of a boring spindle rotatable about a axis, a Work table manually movable transversely of the spindle, and mechanism for measuring; the table movement cor prising a micrometer head and a supglen'ienial dial indicator so related that the sinn their direct readings represents lthe total amount et movement.

G. The combination .in a boring' machine, oit boring spindle rotatable about a fixed axis, a Work table manually movable transversely of the spindle, and mechanism tor measuring,` the table movement comprising end measures and a micrometer head so related that the sum ot their direct readings represents the total amount ot' movement.

7. The combination in a boring machine, oit a boring' spindle rotatable about a iixed axis a Work table manually niovable transversely ot the spindle, and mechanism tor measurinathe table movement comprising' end measures, a micrometer head and a soig- -plemental dial indicator so related that the slim of their direct readinv's. represents he 't total amount oi movement.

S. The combination in a boring machine, of a boring` spindle rotatable about a fixed axis, a Work table manually movable transversely of the spindle, mechanism for measnringthe table movement comprising,` end measures and a micrometer head, and yieldable means for causing a predetermined pressure between the contacting` surfaces ot the measuring mechanism.

9. The combination oit a movable ivorlcarrying; table, a micrometer head normally1 relatively'iixed but capable et a very limitec movement with the table, a measuring element movable with the table and adapted to cooperate with the micrometer head, and a precision device associated with the micrometer head for measuring the movements thereof, thereby enabling; the operator to move it to the desired er. tent and repeatedly to the same extent when necessary l0. The combination ot a mo Table Workcarrying table, a micrometer head normally relatively iixed but capable oit a very limited movement with the table, a measuring` element movable with the table and adapted to cooperate with the micrometer head, and a pree'gion dial indicating device associated with the micrometer head for i easnringg the movemens thereot', thereby nabiing 'the op erator to move it to the desired extent and repeatedly to the .same extent nnen neces-- sary.

il. The combination of a movable Werl:- carrying table, a micrometer head normally relative-ll, fxed but capable ot avery limited movement with the table, incaseringl clet movable with the table and adapted to cooperate with the micrometer head, a prooi sion dial indicatingl device, and multiplying lever interposed between the ricrometer head and the indicating device whereby the indicating; device ser ves to measure the movements oit the micrometer head, thereby enabling the operator to move it to the desired extent and repeatedly to the same extent when necessary.

l2. The combination of a Vahle ivorllz carrying' table, a micrometer hea d normall),v relatively :lined but capable ot very limit-.gl moven ent With the table, a measuring; element movable with the table and adapted to coperate With the micrometer head, a pie cision device associated with the micrometer head for measnring` the movements thereof, thereby enablin the operator to more it to the desired extent and repeatedly to the same extent when necessary, and means it'or limiting;` the movements of the inicroinehw head to a range Within the capacity ot the precision device.

13. The combination of' a movable vorticarrying' table, a micrometer head normalliY relatively fixed but capable ot' a i. ry limited movement with the table, means tor snpnor ing one or more end mecsnres. a measuring element mo-,y ible witl the table and adapted to coopera e directly iv` l,A the micrometer head or imlirt-ictly therewith through the measures, and a precision c evice associated with the micrometer head for measuring` the movements thereof, thereby enabling' he oir erator to move it to the desired extent and repeatedly to the saine extent when necessary.

1.4i. The combination ol.' a mora carrying table1 a mir ioni-ter hea-c relatiiy lv iixed but capable of a rerv movement ivith the table. a l nient niovalne nit-h the table and ad;V to cooperate with the .micrometer .c means 'for resisting' movement et the crometer head in oner direction, and a orecision device associated with the niicromet head for measuring the movements thereof, thereby cnaliiling the operator to move it to ill ESI! the desired extent and repeatedly to the same extent when necessary.

15. The combination olli a movable ivorlcurr)fing;` table, a micrometer head normally relatively lined but capable of a very limited movement with the table, a in-.easuring` ele ment movable with the table and adapted to cooperate With the micrometer head, a spring,- tor resisting moi-rement ot the micrometer head in one direction, and a precision device associated With the micrometer head i'or measuring the mov ments thereof, thereby enabling the operator to move it to the desired extent and repeatedly to the same extent when necessary.

16. The combination et a movable vvorl;H carrvinp,` table, a micrometer head normai relatively iixed but capable of a very limited movement vfith the table, means for supporting one or more end measures, a measuring element movable with the table and adapted lto cooperate directly with the inicrometer hea-d. or indirectly therewith through the end measures, means ttor resisting1 movement of the microinei'zer head in one direction anc for thus insuring a delinite predetermined pressure on the measuring contacts, and a precision device associated with the micrometer head for measuring' the movements thereof, thereby enabling the operator to move it to the desired extent and repeatedly to the same eX- tent when necessary.

17. The combination of a movable Werl:- carrying` table, a micrometer head normally relatively fixed but capable oit a very limited movement with the table, means for supporting one or more end measures, a ineasuringclement movable With the table and adapted to cooperate directly with the micrometer head or indirectly therewith through the end ir'easures, a. spring` ior resisting movement of the micrometer hea-d in one direction and tor thus insuring a dei'i* nite predeternfiined pressure on the measuring contacts, and a precision device associated with the micrometer head ior nieasuring the movements thereof, thereby enabling the operator to nieve it to the desired cxtent and repeatedly to the same extent ivhen necessary.

18. rlhe combination ot a movable verlicarryingtable, a micrometer head having .its stem extending toward the table, a measuringl elen'ient movable with the table and adapted to cooperate with the body of the micrometer head, and a support tor the mi croineter head engaging the rear end oit the barrel tl'iereoll -whereby the bocy of the micrometer head is moved toward or trom the measurina` element when the barrel is turned and `whereby the distance correspending,- toY is readable directly i ,ceases table after adjustment.

rlhe combination or a movable ivorlicarrying,l table, a iueasur ie' mechanism fixed a inst movement ivitliJ the table, a longitud rial measuring` rod associated with the @a le and adapted to directly cooperate with the measuring mechanism, a table cai ried bearing in which the rod is slidably ad- "usta le in accordance with either extreme )o fon or any intermediate position oil the ile, means tor locking the r d to the table g .iding the rod.

2l.. 'lhe combination ot a movable Werlicaiiying` table, measuring mechanism iiXed againstniovement ivitli the table, a longitudinal measuring` rod associated with the table and adapted to directly coperatie with the measuring; mechanism, a table carried `bearing` in Which the rod is slidably adjustable in accordance With either en` treme position or any intermediate position of the table, means for locking, the rod to the table atter adjustment, and means fixed against movement with the table for supporting` and guiding the rod and for holdin@ one or more end measures betiveen the rod and the measuring mechanisr The combination et a movable Werl;- carrjv'ing table, a ineasuringmechanism iixed against movement with the table, a longitudinal measuring` rod associated with the table an(t adapted te directly cooperate with the measuring mechanism, a clamping device whereby the rod may be locked to the table, a longitudinal supporting device positioned adjacent the rod and fixed against n'iovenient with the table, and a table carried bearing ivith Which the rod and the supporting device have slidable enmeiit, the rod being, adjustable inthe bearing in accordance Hwith either extreme position or any intermediate position of the table and the supporting device being adaptled to hold one or more end measures between the rod and the ineasuring,` device.

i) The combination oit a movable Work- 7ing` table, a measurinp,` mechanism iixed movement Twith the table, tivo paral i rails iiiled aga-inst moven'ient a lon. dinal measurino rod positionerll etive and supported bf l fails Y apted to directly coopera th the measuring mechanism, a clamping` device Wheebv 'the rod may be locked to the table,

and a table carried bearing with which the rod and the rails have slidable engagement, the rod being adjustable in the bearing in accordance with either extreme position or any intermediate position of the table and the rails being adapted to support one or more end measures between the rod and the measuring device; 24C. The combination in a boring machine, of a boring spindle rotatable about a fixed axis, a bed, a carriage movable on the bed transversely of the spindle, a work table movable on the carriage transversely of the spindle and at right angles to the direction of carriage movement, traversing screws for the carriage and table respectively, mechanisms supplemental to the screws for measuring respectively the movements of the rarriage on the bed and of the table on the carriage, two independent dil'erently speeded devices for turning each screw, and means for optionally causing either of the devices to be operative whereby the carriage or the table may be moved rapidly for preliminary adjustments or slowly Jfor final adjustments as indicated by the corresponding measuring mechanism.

25. The combination in a boring machine, of a 'boring spindle rotatable about a fixed axis, a bed, a carriage movable on the bed transversely of the spindle, a work table movable on the carriage transversely of the spindle and at right angles to the direction of carriage movement, traversing screws for the carriage and table respectively, mechanisms supplemental to the screws for measuring respectively the movements oi the carriage on the bed and of the table on the carriage, two independent diilerently speeded devices :tor turning each screw, and f means for optionally causing either of the devices to be operative whereby the carriage or the table may be moved rapidly for preliminary adjustments or slowly for iinal adjustments as indicated by the corresponding measuring mechanism or for causing both devices to be inoperative whereby the screw is protected against accidental movements.

26. The combination in a boring machine,

of a vertical boring spindle rotatable about a fixed axis, a bed, a carriage horizontally movable on the bed, a work table horizontally movable on the carriage at right angles to the direction of carriage movement, traversing means for the carriage and table respectively, auxiliary means for supporting work at a level above the top of the table, and a bracket carrying a bearing in alinement with the spindle for supporting the lower end of a boring bar at a point between the table and the work.

27. The combination in a boring machine, of a vertical boring spindle rotatable about a lixed axis, a bed, a carriage horizontally movable on the bed, a work table horizontally movable on the carriage at right angles to the direction or' carriage movement, traversing means for the carriage and table respectively, two auxiliary work-supporting devices each comprising a bottom plate adapted to rest on the table, a top plate adapted to engage the work and a vertical connecting web, and a bracket carrying a bearing for supporting the lower end of a boring bar at a level between the levels ot 'the said plates.

28. The combination in a boring machine, of avertical boring spindle rotatable about a fixed axis, a bed, a carriage horizontally movable on the bed, a work table horizontally movable on the carriage at right angles to the direction of carriage movement, traversing means for the carriage and table respectively, two auxiliary work-supporting devices each comprising a bottom plate adapted to rest on the table, a top plate adapted to engage the work and a vertical connecting web, the said webs being oppositely inclined to provide between them a space which increases in width toward the rear, and a bracket extending into the said space and carrying a bearing for supporting the lower end of a boring bar at a level between the levels of the said plates.

In testimony whereof I hereto afiix my signature.

BENGT M. W. HANSON. 

